Detector base



FIG. 1 is a front view of a detector base;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a top left perspective view thereof;

FIG. 6 is a top right perspective view thereof;

FIG. 7 is a top view tthereof; and,

FIG. 8 is a bottom view thereof.

The broken line showing is for illustrative purposes only and forms nopart of the claimed design.

The ornamental design for a detector base, as shown and described.